RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v26]

[Johannes Bechberger]

On Sun, 1 Jun 2025 18:03:15 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp line 344:
>> 
>>> 342: 
>>> 343: // equals operator for JfrSampleRequest
>>> 344: inline bool operator==(const JfrSampleRequest& lhs, const JfrSampleRequest& rhs) {
>> 
>> Can be removed.
>
> Unless you still want to try the ljf JfrSampleRequest optimization for the native ljf, which I kind of like now that I understand it.

As I said, it's a great optimization. But it needs some work. I therefore remove this method for now.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2120511048